First locate the resistor, it is under the hood, on the firewall, passenger side, close to the blower motor. Unplug the wire connection and remove the three small screws holding it in place, then remove the resistor.
In the truck!
The 2005 Ford F1 50 pickup truck blower motor resistor pack can be found on the firewall in the engine compartment. The blower motor resistor pack is on the passenger side of the firewall.
Under the hood, passenger side firewall, not far from the blower motor.
Most likely a failed blower resistor.
Behind the glove box, remove glove box and two harnesses and you will see the top of it. Its very tight quarters so take your time.
Bad resistor or a malfunction in the switch.
under the left front tire
Blower motor resistor assembly is located under dash board on passenger side.
Remove the wiring harness from the back of your 1996 Chevrolet blower motor. Remove the blower motor retaining bolts. Remove the fan from the blower motor. Reverse the process to install your new blower motor.
I think you should look at your fuse panels and see if you have a blown fuse . Some vehicles have a fuse for high and low blower speeds. Your problem is either the blower motor switch itself or a defective Blower Motor Resistor Pack. More than likely the Resistor Pack is defective.
hhhhhh
blower motor resistor is bad